3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * SPDX-License-Identifier: GPL-2.0+
10 #include <stdio_dev.h>
13 DECLARE_GLOBAL_DATA_PTR;
15 #ifndef CONFIG_NETCONSOLE_BUFFER_SIZE
16 #define CONFIG_NETCONSOLE_BUFFER_SIZE 512
19 static char input_buffer[CONFIG_NETCONSOLE_BUFFER_SIZE];
20 static int input_size; /* char count in input buffer */
21 static int input_offset; /* offset to valid chars in input buffer */
22 static int input_recursion;
23 static int output_recursion;
24 static int net_timeout;
25 static uchar nc_ether[6]; /* server enet address */
26 static struct in_addr nc_ip; /* server ip */
27 static short nc_out_port; /* target output port */
28 static short nc_in_port; /* source input port */
29 static const char *output_packet; /* used by first send udp */
30 static int output_packet_len;
32 * Start with a default last protocol.
33 * We are only interested in NETCONS or not.
35 enum proto_t net_loop_last_protocol = BOOTP;
37 static void nc_wait_arp_handler(uchar *pkt, unsigned dest,
38 struct in_addr sip, unsigned src,
41 net_set_state(NETLOOP_SUCCESS); /* got arp reply - quit net loop */
44 static void nc_handler(uchar *pkt, unsigned dest, struct in_addr sip,
45 unsigned src, unsigned len)
48 net_set_state(NETLOOP_SUCCESS); /* got input - quit net loop */
51 static void nc_timeout(void)
53 net_set_state(NETLOOP_SUCCESS);
56 static int is_broadcast(struct in_addr ip)
58 static struct in_addr netmask;
59 static struct in_addr our_ip;
60 static int env_changed_id;
61 int env_id = get_env_id();
63 /* update only when the environment has changed */
64 if (env_changed_id != env_id) {
65 netmask = getenv_ip("netmask");
66 our_ip = getenv_ip("ipaddr");
68 env_changed_id = env_id;
71 return (ip.s_addr == ~0 || /* 255.255.255.255 (global bcast) */
72 ((netmask.s_addr & our_ip.s_addr) ==
73 (netmask.s_addr & ip.s_addr) && /* on the same net and */
74 (netmask.s_addr | ip.s_addr) == ~0)); /* bcast to our net */
77 static int refresh_settings_from_env(void)
80 static int env_changed_id;
81 int env_id = get_env_id();
83 /* update only when the environment has changed */
84 if (env_changed_id != env_id) {
86 nc_ip = getenv_ip("ncip");
88 return -1; /* ncip is 0.0.0.0 */
89 p = strchr(getenv("ncip"), ':');
91 nc_out_port = simple_strtoul(p + 1, NULL, 10);
92 nc_in_port = nc_out_port;
95 nc_ip.s_addr = ~0; /* ncip is not set, so broadcast */
97 p = getenv("ncoutport");
99 nc_out_port = simple_strtoul(p, NULL, 10);
100 p = getenv("ncinport");
102 nc_in_port = simple_strtoul(p, NULL, 10);
104 if (is_broadcast(nc_ip))
105 /* broadcast MAC address */
106 memset(nc_ether, 0xff, sizeof(nc_ether));
108 /* force arp request */
109 memset(nc_ether, 0, sizeof(nc_ether));
115 * Called from NetLoop in net/net.c before each packet
119 refresh_settings_from_env();
120 if (!output_packet_len || memcmp(nc_ether, net_null_ethaddr, 6)) {
121 /* going to check for input packet */
122 net_set_udp_handler(nc_handler);
123 NetSetTimeout(net_timeout, nc_timeout);
125 /* send arp request */
127 net_set_arp_handler(nc_wait_arp_handler);
128 pkt = (uchar *)net_tx_packet + net_eth_hdr_size() +
130 memcpy(pkt, output_packet, output_packet_len);
131 net_send_udp_packet(nc_ether, nc_ip, nc_out_port, nc_in_port,
136 int nc_input_packet(uchar *pkt, struct in_addr src_ip, unsigned dest_port,
137 unsigned src_port, unsigned len)
141 if (dest_port != nc_in_port || !len)
142 return 0; /* not for us */
144 if (src_ip.s_addr != nc_ip.s_addr && !is_broadcast(nc_ip))
145 return 0; /* not from our client */
147 debug_cond(DEBUG_DEV_PKT, "input: \"%*.*s\"\n", len, len, pkt);
149 if (input_size == sizeof(input_buffer))
150 return 1; /* no space */
151 if (len > sizeof(input_buffer) - input_size)
152 len = sizeof(input_buffer) - input_size;
154 end = input_offset + input_size;
155 if (end > sizeof(input_buffer))
156 end -= sizeof(input_buffer);
159 if (end + len > sizeof(input_buffer)) {
160 chunk = sizeof(input_buffer) - end;
161 memcpy(input_buffer, pkt + chunk, len - chunk);
163 memcpy(input_buffer + end, pkt, chunk);
170 static void nc_send_packet(const char *buf, int len)
172 struct eth_device *eth;
178 debug_cond(DEBUG_DEV_PKT, "output: \"%*.*s\"\n", len, len, buf);
184 if (!memcmp(nc_ether, net_null_ethaddr, 6)) {
185 if (eth->state == ETH_STATE_ACTIVE)
186 return; /* inside net loop */
188 output_packet_len = len;
190 NetLoop(NETCONS); /* wait for arp reply and send packet */
192 output_packet_len = 0;
196 if (eth->state != ETH_STATE_ACTIVE) {
197 if (eth_is_on_demand_init()) {
200 eth_set_last_protocol(NETCONS);
202 eth_init_state_only();
206 pkt = (uchar *)net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE;
207 memcpy(pkt, buf, len);
210 net_send_udp_packet(ether, ip, nc_out_port, nc_in_port, len);
213 if (eth_is_on_demand_init())
216 eth_halt_state_only();
220 static int nc_start(struct stdio_dev *dev)
224 nc_out_port = 6666; /* default port */
225 nc_in_port = nc_out_port;
227 retval = refresh_settings_from_env();
232 * Initialize the static IP settings and buffer pointers
233 * incase we call net_send_udp_packet before NetLoop
240 static void nc_putc(struct stdio_dev *dev, char c)
242 if (output_recursion)
244 output_recursion = 1;
246 nc_send_packet(&c, 1);
248 output_recursion = 0;
251 static void nc_puts(struct stdio_dev *dev, const char *s)
255 if (output_recursion)
257 output_recursion = 1;
261 int send_len = min(len, (int)sizeof(input_buffer));
262 nc_send_packet(s, send_len);
267 output_recursion = 0;
270 static int nc_getc(struct stdio_dev *dev)
276 net_timeout = 0; /* no timeout */
282 c = input_buffer[input_offset++];
284 if (input_offset >= sizeof(input_buffer))
285 input_offset -= sizeof(input_buffer);
291 static int nc_tstc(struct stdio_dev *dev)
293 struct eth_device *eth;
302 if (eth && eth->state == ETH_STATE_ACTIVE)
303 return 0; /* inside net loop */
308 NetLoop(NETCONS); /* kind of poll */
312 return input_size != 0;
315 int drv_nc_init(void)
317 struct stdio_dev dev;
320 memset(&dev, 0, sizeof(dev));
322 strcpy(dev.name, "nc");
323 dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
324 dev.start = nc_start;
330 rc = stdio_register(&dev);
332 return (rc == 0) ? 1 : rc;